Well to save you wondering if the Apple will give any of us refund - the answer is NO.
Here is the repy I have received after I asked to get my money back:
+I understand that since your computer does not meet the system requirements you+
+would like a refund. I am very sorry to hear you have run into this issue. I+
+will do my best to assist you!+
+Your request for a refund was carefully considered; however, according to the+
+iTunes Store Terms of Sale, all purchases made on the iTunes Store are final.+
+This policy matches Apple's refund policies and provides protection for+
+copyrighted materials.+
+You can review the iTunes Store Terms of Sale for more information:+
+
http://www.apple.com/legal/itunes/us/sales.html+
+I would recommend that you ask someone who has a computer that meets all the+
+system requirements if you can download your purchases. Once you have found a+
+computer that meets the requirements, reply and I will allow you to redownload+
+all of your purchases. After downloading onto that computer, you can burn all+
+your purchases to a disk and copy them to your computer.+
+I hope you continue to enjoy the iTunes Store, and if you have any other+
+problems with this issue, don't hesitate to reply to this email, and we'll be+
+more than happy to help you out! I hope that this information will assist you+
+with your issue. Thank you for contacting the iTunes Store Support Team. Have+
+a fantastic day!+
+Best Wishes,+
Brooke